Lena
| Name | Lena |
| Type | Sailing vessel
|
| GRT | 371 tons |
| Country |  Swedish |
| Built | 1871
|
| Builder | George Robinson, Blyth
|
| Operator | S.P. Pettersson, Uddevalla
|
| History | Wooden bark. Built as Margaret Knight, more recently named Concordia.
|
U-boat attacks on Sailing vessel Lena
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 9 Jun 1918 | UB 64 (Otto von Schrader) | prize | Taken as prize in the Kattegat, freed in Swinemunde on September 17, 1918
|
| Gothenburg - Spain
|
| 0
|
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